Display device and driving method of display device

Abstract

A display device includes a display panel including: a plurality of pixels; and a signal controller which generates, on a frame-by-frame basis, a display signal based on an input image signal and a control signal from an outside. The signal controller includes a memory which stores a preset image signal, a receiver which receives the control signal, a clock signal modulator which generates an internal clock signal having a first frequency during a blank period, which is determined based on the control signal in a frame period, and a data processor which reads the preset image signal from the memory in response to the internal clock signal for an image processing.

What is claimed is: 
     
       1. A display device comprising:
 a display panel including a plurality of pixels; and 
 a signal controller which generates, on a frame-by-frame basis, a display signal based on an input image signal and a control signal from an outside, 
 wherein the signal controller comprises: 
 a memory which stores a preset image signal, 
 a receiver which receives the control signal, wherein an active period is a period in which the control signal is varied between an enable level and a disable level in a frame period, and a blank period is a period in which the control signal is sustained at the disable level in the frame period, 
 a clock signal modulator which generates an internal clock signal having a first frequency during the blank period, and 
 a data processor which performs an image processing for the input image signal in the active period, reads the preset image signal from the memory during the blank period in response to the internal clock signal and performs the image processing for the preset image signal during the blank period, 
 wherein image data, in which the preset image signal is image-processed, is not output from the signal controller during the blank period, and image data, in which the preset image signal is image-processed during the active period, is output from the signal controller during the active period. 
 
     
     
       2. The display device of  claim 1 , wherein
 the control signal includes:
 a data enable signal including a pulse having an enable level during the active period and a pulse having a disable level during the blank period, wherein the active period is a remaining period in the frame period other than the blank period, and 
 a main clock signal having a frequency equal to or higher than the first frequency. 
 
 
     
     
       3. The display device of  claim 1 , wherein
 the internal clock signal has a frequency equal to or higher than the first frequency during the active period, which is determined based on the control signal in the frame period. 
 
     
     
       4. The display device of  claim 3 , wherein
 the data processor performs the image processing for the input image signal during the active period, and 
 the signal controller further comprises a transmitter which outputs the input image signal after the data processor performs the image processing therefor. 
 
     
     
       5. The display device of  claim 1 , wherein
 the first frequency of the internal clock signal varies during the blank period. 
 
     
     
       6. The display device of  claim 5 , wherein
 the clock signal has at least three different frequencies during the blank period. 
 
     
     
       7. The display device of  claim 1 , wherein
 the image processing includes at least one of a color correction, a luminance non-uniformity correction, a color characteristic compensation and a dynamic capacitance compensation. 
 
     
     
       8. The display device of  claim 1 , wherein
 the memory stores the input image signal of a previous frame, which is input to the signal controller, as the preset image signal. 
 
     
     
       9. The display device of  claim 1 , wherein
 the memory stores the input image signal of a previous frame, for which the image processing is performed by the data processor, as the preset image signal. 
 
     
     
       10. The display device of  claim 1 , wherein
 the memory further stores correction data to be used for the image processing, and 
 the data processor includes:
 a first data processor which performs the image processing with reference to the correction data of the memory; and 
 a second data processor which performs the image processing without reference to the memory. 
 
 
     
     
       11. The display device of  claim 10 , wherein
 the clock signal modulator outputs only the internal clock signal to the first data processor during the blank period. 
 
     
     
       12. A driving method of a display device including a display panel and a signal controller, the method comprising:
 receiving a control signal from an outside by the signal controller; 
 determining a blank period in a frame period by the signal controller based on the control signal; 
 generating an internal clock signal having a first frequency by the signal controller during the blank period; and 
 reading a preset image signal from a memory of the signal controller during an active period and the blank period in response to the internal clock signal by the signal controller and performing an image processing for the preset image signal by the signal controller during the active period and the blank period, 
 wherein image data, in which the preset image signal is image-processed, is not output from the signal controller during the blank period, and image data, in which the preset image signal is image-processed during the active period, is output from the signal controller during the active period. 
 
     
     
       13. The driving method of  claim 12 , wherein
 the signal controller generates an internal clock signal having a frequency equal to or higher than the first frequency during the active period, which is a remaining period in the frame period other than the blank period. 
 
     
     
       14. The driving method of  claim 13 , further comprising:
 receiving the input image signal from the outside by the signal controller, 
 wherein the signal controller performs the image processing for the input image signal during the active period to be output to the display panel. 
 
     
     
       15. The driving method of  claim 12 , wherein
 the first frequency of the internal clock signal varies during the blank period. 
 
     
     
       16. The driving method of  claim 15 , wherein
 the clock signal has at least three different frequencies during the blank period. 
 
     
     
       17. The driving method of  claim 12 , wherein
 the image processing includes at least one of a color correction, luminance non-uniformity correction, a color characteristic compensation and a dynamic capacitance compensation.